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Brünnich's Guillemot vs Ancient Murrelet

Uria lomvia versus Synthliboramphus antiquus

Practice

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Brünnich's Guillemot (Uria lomvia) Brünnich's Guillemot
Ancient Murrelet (Synthliboramphus antiquus) Ancient Murrelet

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Brünnich's Guillemot · Ancient Murrelet · My Tricky Birds